EP0019113B1 - Feuille en polyamide aromatique semblable au papier et procédés pour sa préparation - Google Patents

Feuille en polyamide aromatique semblable au papier et procédés pour sa préparation Download PDF

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Publication number
EP0019113B1
EP0019113B1 EP19800102204 EP80102204A EP0019113B1 EP 0019113 B1 EP0019113 B1 EP 0019113B1 EP 19800102204 EP19800102204 EP 19800102204 EP 80102204 A EP80102204 A EP 80102204A EP 0019113 B1 EP0019113 B1 EP 0019113B1
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EP
European Patent Office
Prior art keywords
sheet
paper
aromatic polyamide
cross
isocyanurate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19800102204
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German (de)
English (en)
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EP0019113A1 (fr
Inventor
Hideharu Sasaki
Keizo Shimada
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Teijin Ltd
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Teijin Ltd
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Priority claimed from JP5564079A external-priority patent/JPS55148300A/ja
Priority claimed from JP6493879A external-priority patent/JPS55158398A/ja
Application filed by Teijin Ltd filed Critical Teijin Ltd
Publication of EP0019113A1 publication Critical patent/EP0019113A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide

Definitions

  • the present invention relates to an artificial paper-like sheet and processes for producing the same. More particularly, the present invention relates to an aromatic polyamide paper-like sheet and processes for producing such a sheet.
  • GB-Patent Specification, 1,174,433 discloses a paper-like sheet composed of a sheet made of aromatic polyamide fibers and a bonding layer of one or more organosilicon compounds which may contain a cross-linking agent.
  • aromatic polyamide is in the form of fibers but not in the form of pulp particles.
  • cross-linking agent is contained in the organosilicon bonding layer and used to cross-link the organosilicon molecules but not the aromatic polyamide molecules.
  • GB-Patent Specification 1,184,599 discloses a process for producing a sheet from a polyamide composition containing a cross-linking agent.
  • the polyamides used in the invention of the GB patent is limited to aliphatic polyamide. That is, the use of aromatic polyamides is not disclosed in this GB patent.
  • the sheet material of this GB patent contains no fiber ingredient consisting of a number of short fibers.
  • the polyamide is not in the form of pulp particles.
  • GB-Patent Specification 1,348,006 discloses a process for producing a sheet structure from an aqueous suspension or paste of fibrous internally cross-linked polyamine particles.
  • the conventional aromatic polyamide paper-like sheets are unsatisfactory not only in heat-resistance, for example, dimensional stability at an elevated temperature, but also, in the electric insulating property, for example, dielectric breakdown strength.
  • An object of the present invention is to provide an aromatic polyamide paper-like sheet having excellent heat resistance and electric insulating properties, together with excellent mechanical properties and resistance to chemicals, and processes for producing the same.
  • the aromatic polyamide paper-like sheet of the type which comprises an aromatic polyamide artificial pulp ingredient comprising a number of amorphous particles consisting of at least one aromatic polyamide material and a fiber ingredient consisting of a number of short fibers bonded to each other with said artificial pulp ingredient, the ratio in weight of said artificial pulp ingredient to said fiber ingredient being in a range of from 1:9 to 9:1, which sheet is characferized in that the aromatic polyamide molecules contained at least in said amorphous pulp particles is cross-linked with a cross-linking agent which comprises at least one compound selected from the group consisting of (A) organic cross-linking compounds containing at least one epoxy radical; (B) organic cross-linking compounds having at least one radical selected from those of the formulae (B-1) and (B-II): wherein R 4 , R 5 , R s and R 7 respectively represent, independently from each other, a hydrogen atom or an alkyl radical having 1 to 3 carbon atoms, and R
  • the above-specified aromatic polyamide paper-like sheet can be produced by a process of the present invention comprising the steps of:
  • the above-specified aromatic polyamide paper-like sheet can also be produced by another process of the present invention which comprises the steps of:
  • the aromatic polyamide paper-like sheet of the present invention comprises an artificial pulp ingredient comprising a number of amorphous particles consisting of at least one aromatic polyamide material and a fiber ingredient comprising a number of short fibers bonded to each other with the amorphous aromatic polyamide particles in the artificial pulp ingredient.
  • aromatic polyamide material refers to a film-forming polymeric material which consists of an aromatic polyamide and exhibits a degree of solubility of 3% by weight or more, preferably, 5% by weight or more, in an amide type polar solvent, for example, N-methyl-2-pyrrolidone.
  • the aromatic polyamide contain at least 75 molar % of repeating units selected from the group consisting of those of the formulae (I) and (II): wherein Ar l , Ar 2 and Ar 3 respectively present, independently from each other, an unsubstituted or substituted divalent aromatic radical which comprises a single aromatic ring, or two or more aromatic rings that are condensed together, or are linked together by a single bond, or by a bridging atom or radical, and which.. is oriented ether meta or para, and R" R 2 and R 3 respectively represent, independently from each other, a hydrogen atom or an alkyl radical having 1 to 3 carbon atoms.
  • Ar,, Ar 2 and Ar 3 be respectively selected, independently from each other, from the group consisting of the radicals of the formulae: wherein R represents a member selected from the group consisting of lower alkyl radicals having 1 to 6 carbon atoms, lower alkoxy radicals having 1 to 6 carbon atoms, halogen atoms and a nitro radical, n represents zero or an integer of from 1 to 4 and X represents a member selected from the group consisting of wherein Y represent a member selected from the group consisting of a hydrogen atom and lower alkyl radicals having 1 to 6 carbon atoms.
  • the aromatic polyamide usable for the present invention can be produced by any of the conventional polymerization methods, for instance, a solution polymerization method and an interface polymerization method, from an aromatic dicarboxylic acid chloride with an aromatic diamine or from an aromatic amino acid.
  • the short fibers usable for the present invention can be selected from inorganic short fibers, for instance, glass short fibers, asbestos and silica short fibers, and organic short fibers having excellent heat resistance and electric insulating property, for example, polyester short fibers and aromatic polyamide short fibers. It is preferable that the short fibers be made from an aromatic polyamide material which is usable for the artificial pulp ingredient. In this case, it is also preferable that the molecules of the aromatic polyamide short fibers in the paper-like sheet be cross-linked with the cross-linking agent.
  • the short fibers preferably have a denier of from 0.5 to 10, more preferably, from 1.0 to 3.0, and a length of from 1 to 10 mm, more preferably, from 3 to 8 mm.
  • the ratio in weight of the artificial pulp ingredient to the fiber ingredient is in a range of from 1:9 to 9:1, preferably, from 2:8 to 8:2.
  • the ratio is smaller than 1 :9, the resultant paper-like sheet exhibits a poor electric insulating property, for example, a poor dielectric breakdown strength, and poor mechanical properties, for example, a poor tensile strength and ultimate elongation.
  • the ratio is larger than 9:1, the resultant paper-like sheet exhibits a poor oil-impregnating property and poor mechanical properties, for instance, poor tensile strength and ultimate elongation.
  • the cross-linking agent usable for the present invention contains at least one cross-linking compound which may be selected from the group consisting of:
  • cross-linking compounds (A), (B) and (C) are capable of forming cross- linkages having excellent resistances to heat and chemicals, between the molecules of the aromatic polyamide.
  • the cross-linking compound (A) may have at least two epoxy radical.
  • the cross-linking compound (A) having two or more epoxy radicals may be selected from the group consisting of (1) bisphenol A type epoxy compounds of the formula (A ⁇ I): wherein n represents zero or an integer of from 1 to 3, and; (2) cyanurate and isocyanurate type epoxy compounds of the formulae (A ⁇ II) and (A ⁇ III): and wherein Q, represents a di-, tri- or tetra-valent organic radical; Q 2 represents a single bond or a di- or more valent organic radical; at least two members of E 1 through E 5 respectively represent, independently from each other, a radical selected from those of the formulae (A-IV) and (A ⁇ V): in which R 9 , R 10 , and R 11 respectively represent, independently from each other, a hydrogen atom or an organic radical, and the remaining members thereof respectively represent, independently from each other, a radical selected from those of the formulae (A-IV) and (A-V)
  • the cyanurate and isocyanurate type epoxy compounds of the formulae (A ⁇ II) and (A-III) may include tris(glycidyl)isocyanurate, di(glycidyl)methyl isocyanurate, di(glycidyl)ethyl isocyanurate, ethylene-bis(diglycidyl isocyanurate), oxydiethylene bis(diglycidyl isocyanurate), diglycidylallylisocyanurate, tris(glycidyl)cyanurate, di(glycidyl)methyl cyanurate, di(glycidyl)ethyl cyanurate, ethylenebis(glycidyl cyanurate), tetramethylene(diglycidyl cyanurate), oxydiethylene bis(diglycidyl cyanurate), and di(glycidyl)allylcyanurate.
  • cyanurate and isocyanurate compounds can be prepared in accordance with the methods of, for example, Zn.Organ.Khim.2(10), 1742(1965); J.Am.Chem.Soc., 73, 3003(1951), and; Kunscher 55, 641(1965).
  • the cross-linking compound (B) may be selected from (1) amide and imide type compounds having at least one radical selected from those of the formulae (B-1) and (B ⁇ II), and; (2) cyanurate and isocyanurate type compounds having a formula selected from the formulae (B ⁇ III) and (B-IV): and wherein Q, represents a di-, tri- or tetra-valent organic radical; Q 2 represents a single bond or a di- or more valent organic radical; at least two members of G i through G s respectively represent, independently from each other, a radical selected from those of the formulae (B-1) and (B ⁇ II), and the remaining members thereof respectively represent, independently from each other; a radical selected from those of the formulae (B-1) and (B ⁇ II) and a monovalent radical corresponding to the radical represented by Q,; r represents zero by 1; p represents zero or an integer of from 1 to 10, and; q represents an integer of from 1 to 3.
  • the above-specified amide and imide type cross-linking compounds may include N,N'- diallyladipic acid amide, N,N'-dimethallyl adipic acid amide, N,N'-dicrotyl adipic acid amide, N,N'-diallyl terephthalic acid amide, N,N'-diallyl isophthalic acid amide, N,N'-diallylnaphthalene carboxylic acid amide, N,N',N"-triallyl trimellitic acid amide, N,N,N',N'-tetraallyl adipic acid amide, N,N,N',N'-tetraallyl terephthalic acid amide, N,N-diallylbenzamide, N,N,N',N',N",N"-hexallyl trimellitic acid amide, N,N,N',N',N",N",N''',N''-octaallyl pyrom
  • the specified cyanurate and isocyanurate cross-linking agent of the formulae (B ⁇ III) and (B-IV) may include triallyl isocyanurate, diallylmethyl isocyanurate ethylene bis(diallyl isocyanurate), hexamethylene bis(diallyl isocyanurate), oxydiethylene-bis(diallyl isocyanurate), polyethylene allyl isocyanurate having at least one terminal radical consisting of a diallyl isocyanurate residue, polypropylene allyl isocyanurate having at least one terminal radical consisting of a diallyl isocyanurate residue, polytetramethyleneallyl isocyanurate having at least one terminal radical consisting of a diallyl isocyanurate radical, triallyl cyanurate, diallylmethyl cyanurate, ethylene bis(diallyl cyanurate), hexamethylene bis(diallyl cyanurate), hexamethylene bis(diallyl cyanurate
  • the cross-linking compound (B) having the radicals of the formulae (B-1) and/or (B-II) may be triacryl formal, trivinyl cyanurate or tripentenyl cyanurate.
  • the bis-maleimide cross-linking compound (C) may be selected from N,N'-ethylene bismaleimide, N,N'-m-phenylene bismaleimide, N,N'-p-phenylene bismaleimide, N,N'-4,4'-diphenylmethane bismaleimide, N,N'-4,4'-diphenylether bismaleimide, N,N'-4,4'-diphenylsulfone bismaleimide, N,N'-m-xylylene bismaleimide and N,N'-p-xylylene bismaleimide.
  • the cross-linking agent is usually used in an amount of 10% or less based on the entire weight of the aromatic polyamide material contained in the paper-like sheet.
  • the aromatic polyamide paper-like sheet of the present invention may contain a solid inorganic additive, in addition to the pulp ingredient and the fiber ingredient.
  • the solid inorganic additive may be selected from mica, asbesto, glass flakes, quartz powder, talc, kaoline, and alumina, which are effective for enhancing the oil-absorbing property, heat resistance and electric insulating property of the resultant paper-like sheet and the paper-making property the slurry.
  • the solide inorganic additive is used in an amount of from 5 to 400%, preferably, from 10 to 200%, based on the weight of the artificial pulp ingredient.
  • the aromatic polyamide material in the pulp ingredient and, optionally, the aromatic polyamide fibers in the fiber ingredient are cross-tinked with the cross-linking agent, and, therefore, exhibit an excellent resistance to heat and the organic solvent, for example, N-methyl-2-pyrrolidone, N,N-dimethyl formamide and N,N-dimethyl acetamide, and an excellent electric insulating property. It is important that the above-mentioned excellent properties can be obtained without causing the mechanical properties of the paper-like sheet to be deteriorated.
  • m-phenylene isophthalamide type polymers are soluble in an amide type polar solvent such as N-methyl-2-pyrrolidone, N,N-dimethyl formamide or N,N-dimethyl acetamide.
  • amide type polar solvent such as N-methyl-2-pyrrolidone, N,N-dimethyl formamide or N,N-dimethyl acetamide.
  • the heat treatment causes the polymers to become insoluble in the solvent.
  • the soluble type of polymer is referred to as a a-type m-phenylene isophthalamide type polymer and the insoluble type of polymer is referred to as a /3-type m-phenylene isophthalamide type polymer.
  • the A-type polymer is soluble in a solution of a salt such as lithium chloride or calcium chloride in the amide type polar solvent.
  • the aromatic polyamide material contained therein is substantially insoluble in the solution of the salt in the amide type polar solvent, because the aromatic polyamide material is cross-linked.
  • both the a-type and A-type m-phenyleneisophthalamide polymers can be completely dissolved in a concentrated sulfuric acid.
  • the cross-linked paper-like sheet of the present invention is immersed in the concentrated sulfuric acid, 5% by weight or more of the paper-like sheet can be .retained in the non-dissolved state.
  • an aromatic polyamide material and a cross-linking agent are dissolved in an organic solvent to prepare a polymer solution.
  • the organic solvent is usually selected from amide type polar solvents, for instance, N-methyl-2-pyrrolidone, N,N-dimethyl formamide and N,N-dimethyl acetamide.
  • the content of the aromatic polyamide material in the polymer solution is variable depending on the type of and degree of polymerization the aromatic polyamide material, and type of the solvent. However, usually, it is preferable that the content of the aromatic polyamide material in the polymer solution be in a range of from 2 to 15% based on the entire weight of the polymer solution. Also, it is preferable that the amount of the cross-linking agent in the polymer solution be in a range of from 0.1 to 10%, based on the weight of the aromatic polyamide material. Furthermore, the polymer solution may contain 1 to 10%, preferably, from 3 to 9%, of water based on the entire weight of the polymer solution.
  • the polymer solution is brought into contact with a coagulating liquid while vigorously stirring the coagulating liquid to prepare a number of amorphous particles of a coagulated mixture of the aromatic polyamide material with the cross-linking agent.
  • the coagulating liquid is not limited to one having a specific composition, as long as the coagulating liquid is effective for coagulating the mixture of the aromatic polyamide material with the cross-linking agent therefrom.
  • the coagulating liquid consist of an aqueous solution of 10 to 48% by weight, more preferably, 30 to 45% by weight, of N-methyl-2-pyrrolidone.
  • the coagulating liquid preferably has a temperature of 5 to 80°C, more preferably, 35 to 45°C.
  • the coagulating liquid When the polymer solution is brought into contact with the coagulating liquid, the coagulating liquid is vigorously stirred to an extent sufficient for rapidly removing the organic solvent from the drops of the polymer solution, so as to cause the coagulation of the mixture of the aromatic polyamide material with the cross-linking agent, and for vigorously shearing and beating the drops of the polymer solution and the resultant particles of the coagulated mixture, so as to form a number of amorphous particles.
  • the resultant amorphous particles are separated from the coagulating liquid to provide an artificial pulp ingredient, by means of, for instance, filtration or centrifugation.
  • the artificial pulp ingredient and a fiber ingredient comprising a number of short fibers are suspended in water to prepare a slurry.
  • the ratio in weight of the artificial pulp ingredient to the fiber ingredient is in a range of from 1:9 to 9:1.
  • the slurry is subjected to a paper-making method to prepare a precursory paper-like sheet.
  • the paper-making method is not limited to a specific type of method.
  • a preferable paper-making method is a wet paper-making method using a long net type or circular net type paper-making machine.
  • the precursory paper-like sheet is subjected to a cross-linking procedure in which heat, ultraviolet rays and/or electron rays are applied to the precursory paper-like sheet to as to cross-link the molecules of the aromatic polyamide in the sheet.
  • heat it is preferable that the precursory paper-like sheet be heated at a temperature of from 110 to 360°C, more preferably, from 150 to 330°C.
  • the cross-linking temperature is variable depending on the types of the cross-linking agent and the aromatic polyamide, degrees of crystallinity and polymerization of the polymers in the artificial pulp ingredient and the fiber ingredient.
  • an ultra- violet ray source having an output of from 0.5 to 5 KW be spaced 1 to 100 cm from the precursory paper-like sheet.
  • the radiation of ultra-violet rays is preferably carried out for 10 to 1000 seconds.
  • the application of ultra-violet rays can be carried out concurrently with or before the application of heat to the precursory paper-like sheet. In this case, it is preferable that the precursory paper-like sheet be heated at a temperature of from 110 to 360°C.
  • a photosensitizer for example, benzophenone, may be contained in the precursory paper-like sheet.
  • the electron rays be applied at a dose of 0.5 Mrad or more to the precursory paper-like sheet.
  • the application of electron rays may be carried out concurrently with or before the application of heat to the precursory paper-like sheet.
  • the precursory paper-like sheet is preferably heated at a temperature of from 110 to 360°C.
  • the paper-like sheet may be pressed under a pressure of 4000 N/cm 2 or less, by using a presser or nip rollers.
  • the pressing operation may be carried out while heating the paper-like sheet at a desired temperature, preferably, from 110 to 360°C.
  • an artificial pulp ingredient is prepared from a polymer solution containing an aromatic polyamide material and no cross-linking agent.
  • the artificial pulp ingredient containing no cross-linking agent is suspended together with a fiber ingredient in water.
  • the resultant slurry is used for producing a precursory paper-like sheet.
  • the precursory paper-like sheet is impregnated with a cross-linking agent by applying a solution of the cross-linking agent thereto by means of spray, immersion or coating.
  • the precursory paper-like sheet impregnated with the cross-linking agent is subjected to the cross-linking operation as described above.
  • This type of process is effective when the cross-linking agent is very soluble in the organic solvent for preparing the polymer solution and, therefore, it is difficult to retain a desired amount of the cross-linking agent in the artificial pulp ingredient.
  • the cross-linking operation is effective for enhancing the resistance of the paper-like sheet to heat and chemicals, and the electric insulating property of the paper-like sheet, without deteriorating the mechanical properties, for example, the tensile strength, of the paper-like sheet.
  • the cross-linkage is especially effective for reinforcing the combination (entanglement) of the pulp particles and the short fibers in the paper-like sheet.
  • the reinforced combination is also effective for enhancing the heat-resistance of the paper-like sheet.
  • the heat treatment which is applied to the precursory paper-like sheet during or before the cross-linking operation causes the cross-linking agent to be melted.
  • the melted cross-linking agent serves as a plasticizer for the artificial pulp particles and increases the density of the artificial pulp particles in the paper-like sheet. This increase in the density of the artificial pulp particles is effective for enhancing the electric insulating properties such as the dielectric breakdown strength, of the paper-like sheet of the present invention.
  • the aromatic polyamide paper-like sheet of the present invention is useful in various fields, for example, as a heat-resistance insulating material, F.P.C. substrate film and film for data processing business.
  • the amount of a portion of the paper-like sheet not dissolved in a concentrated sulfuric acid was determined in the following manner.
  • the amount of a portion of the paper-like sheet not dissolved in a solution of lithium chloride in N-methyl-2-pyrrolidone was determined in the same manner as that mentioned above, except that a solution of 4.5% by weight of lithium chloride in N-methyl-2-pyrrolidone was used instead of the concentrated sulfuric acid and the treatment was carried out at a temperature of 75°C for 3 hours.
  • the amount of a portion of the paper-like sheet not dissolved in N-methyl-2-pyrrolidone was determined in the same manner as that mentioned above, except that N-methyl-2-pyrrolidone alone was used in place of the lithium chloride solution and the treatment was carried out at a temperature of 75°C for three hours.
  • the non-dissolved amount C (%) of the paper-like sheet was calculated from the equation: wherein W o is as defined above and W 3 represent a dry weight of the treated paper-like sheet.
  • the dielectric breakdown strength of the paper-like sheet was determined in accordance with Japanese Industrial Standard C 2111 by using an AC voltage.
  • the shrinkage of the paper-like sheet was measured by heating the sheet at a temperature of 300°C for 24 hours.
  • the shrinkage D (%) of the paper-like sheet was calculated from the equation: wherein L o represents a length between two points marked on the non-heated paper-like sheet and L, represents a length between the marked two points on the heated paper-like sheet.
  • the stability in form of the paper-like sheet was determined by immersing a piece of the paper-like sheet having a width of 5 mm and a length of 50 mm in an 85% sulfuric acid, at a temperature of 25°C for 24 hours, washing the immersed piece, drying the washed piece, and then, observing the dried piece by the naked eye.
  • a polymer solution was prepared by uniformly dispersing (1) 60 parts by weight of a poly-m-phenylene isophthalamide powder which had been prepared by an interface polymerization method and which exhibited an intrinsic viscosity of 1.35, determined in N-methyl-2-pyrrolidone, at a concentration of 0.5 g/dl, and (2) 3 parts by weight of a cross-linking agent as indicated in Table 1, in a mixture solvent which had been prepared from 940 parts by weight of N-methyl-2-pyrrolidone and 60 parts by weight of water, and which had been cooled to a temperature of about 5°C, and; by heating the dispersion to a temperature of about 50°C.
  • a coagulating liquid was prepared by mixing 35% by weight of N-methyl-2-pyrrolidone with 65% by weight of water and, then, cooling the mixture to a temperature of 39°C.
  • a tube type continuous coagulating apparatus having a stirrer, which was provided with a combination of a stator having a baffle and a turbine paddle type rotor having two paddles, and was provided with an inlet for feeding the polymer solution and the coagulating liquid, and an outlet for discharging the resultant slurry containing the artificial pulp particles, was used.
  • the polymer solution and the coagulating liquid were concurrently fed through the inlet into the coagulating apparatus at feed rates of 0.5 kg/min and 5 kg/min, respectively, while vigorously stirring the mixture at a rotation rate of 7100 rpm of the rotor.
  • the resultant slurry of the coagulated artificial pulp particles was discharged from the outlet.
  • the slurry was filtered by using a Nutsche type filter to evaporate the coagulated artificial pulp particles from the coagulating liquid.
  • the artificial pulp articles were washed with ion-exchanged water.
  • the washed pulp articles in a dry weight of 1.2 g were suspended together with 0.8 g of a fiber ingredient consisting of a poly-m-phenylene isophthalamide short fibers, each having a denier of 1.5 and length of 7 mm, in 1 liter of water, to prepare an aqueous slurry.
  • a precursory paper-like sheet was made from the aqueous slurry by using a Tappi Standard Sheet Machine.
  • the paper-making operation could be carried out without difficulty and the resultant sheet had a satisfactory quality.
  • the precursory paper-like sheet was dried and, then, heated at a temperature of 270°C while pressing it under a pressure of 2000 N/cm 2 .
  • the resultant paper-like sheet a weight of 110 g/m 2 and a thickness of 0,1 mm.
  • Example 5 through 8 the same procedures respectively as those described in Examples 1 through 4 were carried out, except that in each example, the cross-linking agent as indicated in Table 1 was not contained in the polymer solution and the dried precursory paper-like sheet was immersed in a solution of 3% by weight of the cross-linking agent in tetrahydrofuran (THF), at room temperature, for 10 minutes and, then, air dried to completely evaporate away THF.
  • THF tetrahydrofuran
  • the cross-linking agent-containing precursory paper-like sheet was heated at a temperature of 270°C while pressing it under a pressure of 2000 N/cm 2 .
  • the resultant paper-like sheet in each example had a weight of 110 g/m 2 and a thickness of 0,1 mm, and exhibited properties as indicated in Table 1.
  • Example 2 The same procedures as those described in Example 1 were carried out, except that no cross-linking agent was used.
  • the resultant comparative paper-like sheet had a weight of 110 gfm 2 and a thickness of 0,1 mm, and exhibited the properties as indicated in Table 1.
  • Example 9 the same procedures as those described in Example 1 were carried out, except that the polymer solution contained no cross-linking agent, and after the precursory paper-like sheet was dehydrated at room temperature, the precursory sheet was immersed in an aqueous solution containing 0.25% by weight of tris(glycidyl)isocyanurate (TGIC) for a time sufficient to completely replace water in the precursory sheet by the TGIC aqueous solution, and then, dried.
  • TGIC tris(glycidyl)isocyanurate
  • the resultant paper-like sheet had a weight of 110 g/m 2 and thickness of about 0,1 mm, and exhibited the properties as indicated in Table 2.
  • Comparison Example 2 the same procedures as those described in Example 9 were carried out, except that no tris(glycidyl)isocyanurate was used. The results are indicated in Table 2.
  • Example 9 The same procedures as those described in Example 9 were carried out, except that the resultant heat-pressed paper-like sheet was subjected to a radiation of ultra-violet rays from a high voltage mercury lamp having an output of 2 KW and spaced 15 cm from the paper-like sheet, for 3 minutes.
  • the resultant paper-like sheet exhibited an amount (A) of the non-dissolved portion thereof in a 98% H 2 so 4 of 51%, an amount (B) of the non-dissolved portion thereof in a LiCI-NMP solution of 60% and an amount (C) of the non-dissolved portion thereof in a NMP of 100%.
  • Example 9 The same procedures as those mentioned in Example 9 were carried out, except that the resultant heat-pressed paper-like sheet was subjected to a radiation of electron beam, at a dose of 5 Mrad, by using a Hipertoron 30 EBCA-300A type electron beam radiation apparatus.
  • the resultant paper-like sheet exhibited in an amount (A) of non-dissolved portion thereof in a 98% H 2 SO 4 of 45%.
  • Example 12 through 17 the same procedures as those mentioned in Example 9 were carried out, except that a cross-linking agent of the type indicated in Table 3 was used in the amount as indicated in Table 3.
  • a cross-linking agent of the type indicated in Table 3 was used in the amount as indicated in Table 3.
  • acetone was used as a solvent for the cross-linking agent. The results are shown in Table 3.
  • Example 18 the same procedures as those described in Example 9 were carried out, except that the cross-linking agent (TGIC) was applied in the amount as indicated in Table 4 to the precursory paper-like sheet.
  • TGIC cross-linking agent
  • Aromatic polyamide short fibers having a denier of 2 and a length of 5 mm were produced from a mixture of 95% by weight of poly-m-phenylene isophthalamide and 5% by weight of tris(glycidyl)isocyanurate (TGIC).
  • TGIC tris(glycidyl)isocyanurate

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Claims (27)

1. Feuille en polyamide aromatique semblable au papier comprenant en tant que constituant une pulpe synthétique de polyamide aromatique contenant des particules amorphes de pulpe en polyamide aromatique et un constituant fibreux constitué par des fibres courtes liées les unes avec les autres au moyen des particules amorphes de pulpe, le rapport en poids de la pulpe synthétique au constituant fibreux variant entre 1:9 et 9:1, caractérisé en ce que les molécules de polyamide aromatique contenues au moins dans les particules amorphes de pulpe sont réticulées au moyen d'un agent réticulant comprenant au moins un composé choisi dans le groupe constitué par:
A des composés organiques réticulants contenant au moins un radical époxy;
B des composés organiques réticulants ayant au moins un radical choisi parmi les radicaux selon les formules (B―I) et (B―II) suivantes:
Figure imgb0042
dans lesquelles R4, R5, RB et R7 représentent respectivement, indépendamment les uns des autres, un atome d'hydrogène ou un radical alkyle ayant de 1 à 3 atomes de carbone, et R4 et R5, R4 et RB, R5 et Re ou Re et R7 peuvent être fusionnés pour former un cycle différent du noyau aromatique, et
C un composé réticulant bis-maléimide selon la formule (C-I) suivante:
Figure imgb0043
dans laquelle RB représente un radical ayant de 1 à 12 atomes de carbone ou un radical aryle.
2. Feuille en polyamide aromatique semblable au papier selon la revendication 1, caractérisé en ce que le polyamide aromatique comprend au moins un polyamide aromatique contenant au moins 75% molaire d'unités répétitives choisies dans le groupe comprenant les radicaux selon les formes (I) et (II) suivantes:
Figure imgb0044
dans lesquelles Arj, Ar2 et Ar3 représentent respectivement indépendamment les uns des autres, un radical aromatique divalent, substitué ou non, qui comprend un seul noyau aromatique ou au plus deux noyaux aromatiques qui sont condensés ou liés par une simple liaison ou par un atome ou un radical de pontage et qui est orienté en méta ou para, et R" R2 et R3 représentant respectivement, indépendamment les uns des autres, un atome d'hydrogène ou un radical alkyle ayant 1 à 3 atomes de carbone.
3. Feuille en polyamide aromatique semblable au papier selon la revendication 2, caractérisée en ce que Ar,, Ar2 et Ar3 dans les formules (I) et (II) sont choisis respectivement, indépendamment les uns des autres dans le groupe comprenant les radicaux selon les formules suivantes:
Figure imgb0045
Figure imgb0046
Figure imgb0047
dans lesquelles R représente un radical choisi dans le groupe comprenant des radicaux alkyles inférieurs ayant de 1 à 6 atomes de carbone, des radicaux alcoxy inférieurs ayant de 1 à 6 atomes de carbone, des atomes halogènes et un radical nitro, n étant zéro ou un nombre entier compris entre 1 à 4 et X représente un élément choisi dans le groupe comprenant
Figure imgb0048
où Y représente un élément choisi dans le groupe comprenant l'atome d'hydrogène et des radicaux alkyles inférieurs ayant de 1 à 6 atomes de carbone.
4. Feuille en polyamide aromatique semblable au papier selon la revendication 1, caractérisée en ce que les fibres courtes faisant partie du constituant fibreux sont choisies dans le groupe comprenant des fibres minérales et organiques.
5. Feuille en polyamide aromatique semblable au papier selon la revendication 4, caractérisée en ce que les fibres minérales sont choisies parmi les fibres de verre, d'amiante et de silice.
6. Feuille en polyamide aromatique semblable au papier selon la revendication 4, caractérisée en ce que les fibres organiques sont des fibres de polyamide aromatique.
7. Feuille en polyamide aromatique semblable au papier selon la revendication 6, caractérisée en ce que les molécules de polyamide aromatique constituant les fibres sont également réticulées à l'aide dudit agent réticulant.
8. Feuille en polyamide aromatique semblable au papier selon la revendication 1, caractérisée en ce que les fibres courtes présentent un denier compris entre 0,5 et 10.
9. Feuille en polyamide aromatique semblable au papier selon la revendication 1, caractérisée en ce que les fibres courtes ont une longueur de 1 à 10 mm.
10. Feuille en polyamide aromatique semblable au papier selon la revendication 1, caractérisée en ce que le composé réticulant (A) possède au moins deux radicaux époxy.
11. Feuille en polyamide aromatique semblable au papier selon la revendication 10, caractérisée en ce que le composé réticulant (A) ayant au moins deux radicaux époxy est choisi dans le groupe comprenant les composés époxy du type bisphénol A selon la formule (A-I):
Figure imgb0049
dans laquelle n représente zéro ou un nombre entier de 1 à 3, et les composés époxy du type cyanurate et isocyanurate suivants: tri -(glycidyl) isocyanurate, di(glycidyl)méthyl isocyanurate, di(glycidyl)éthyl isocyanurate, éthylônebis(diglycidyl isocyanurate), oxydiéthylène bis(diglycidyl isocyanurate), diglycidylallylisocyanurate, tri-(glycidyl)cyanurate, di(glycidyl)méthyl cyanurate, di(glycidyl) éthyl cyanurate, éthylènebis(glycidyl cyanurate), tétraméthylène(diglycidyl cyanurate), oxydiéthylène bis(diglycidyl cyanurate), et di (glycidyl)allylcyanurate.
12. Feuille en polyamide aromatique semblable au papier selon la revendication 1, caractérisée en ce que le. composé réticulant (B) est choisi parmi les composés de type amide et imide ayant au moins un radical choisi parmi ceux selon les formules (B-I) et (B-II) et parmi les composés de type cyanurate et isocyanurate suivants: isocyanurate de triallyle, isocyanurate de diallyl-méthyle, éthylène bis(diallyl isocyanurate) hexaméthylène bis (diallyl isocyanurate), oxydiéthylène-bis(diallyl isocyanurate), un isocyanurate allyle de polyéthylène ayant au moins un radical terminal formé d'un reste d'isocyanurate de diallyle, un isocyanurate allyle de polypropylène ayant au moins un radical terminal formé d'un reste d'isocyanurate de diallyle, un isocyanurate de polytétraméthylèneallyle ayant au moins un radical terminal formé d'un radical d'isocyanurate de diallyle, le cyanurate triallyle, le cyanurate diallyl méthyle, de l'éthylène bis(diallyl cyanurate) l'hexaméthylène bis(diallyl cyanurate) l'oxydiéthylène bis (diallylcyanurate), un cyanurate allyle de polytétraméthylène ayant au moins un radial terminal formé d'un reste de diallyl cyanurate et le cyanurate allyle de polyhexaméthylène ayant au moins un radical terminal formé d'un reste de cyanurate de diallyle.
13. Feuille en polyamide semblable au papier selon la revendication 1, caractérisée en ce que l'agent réticulant est utilisé en quantité égale ou inférieure à 10% par rapport au poids total du constituant polyamide aromatique contenu dans la feuille semblable au papier.
14. Procédé de fabrication de la feuille en polyamide aromatique semblable au papier selon la revendication 1, caractérisée en ce qu'il comprend les étapes suivantes:
- la dissolution d'un polyamide aromatique et d'un agent réticulant dans un solvant organique pour obtenir une solution de polymère,
- la mise en contact de la solution de polymère avec un liquide coagulant accompagné d'agitation énergique du liauide coagulant pour obtenir un mélange de polyamide et d'agent réticulant sous forme de particules amorphes,
- la séparation des particules amorphes du liquide de coagulation pour obtenir le constituant de pulpe synthétique,
- la mise en suspension du constituant de pulpe synthétique ensemble avec un constituant fibreux comprenant des fibres courtes dans l'eau pour obtenir une suspension dans laquelle le rapport en poids de la pulpe ou constituant fibreux varie entre 1:9 et 9:1,
- le façonnage d'une feuille brute semblable au papier à partir de ladite suspension au moyen d'une technique de l'industrie papetière, et
- la réticulation des molécules de polyamide aromatique au moyen de l'agent réticulant à l'intérieur de la feuille semblable au papier par application d'une irradiation choisie parmi les rayons ultraviolets l'irradiation d'électrons et la chaleur à ladite feuille brute, l'agent réticulant étant au moins l'un des composés spécifiés dans la revendication 1.
15. Procédé selon la revendication 14, caractérisé en ce que le solvant organique est choisi parmi les solvants de type amide.
16. Procédé selon la revendication 15, caractérisé en ce que le solvant organique est choisi dans le groupe comprenant la N-méthyl-2-pyrrolidone, la N,N-diméthylformamide et le N,N-diméthyl- acétamide.
17. Procédé selon la revendication 14, caractérisé en ce que la teneur en polyamide aromatique dans la solution de polymère varie entre 2 et 5% en poids de cette solution de polymère.
18. Procédé selon la revendication 14, caractérisé en ce que la solution de polymère contient entre 1 à 1096 d'eau par rapport au poids du polyamide aromatique.
19. Procédé selon la revendication 14, caractérisé en ce que la quantité d'agent réticulant dans la solution de polymère est comprise entre 0,1 et 10% par rapport au poids du polyamide aromatique.
20. Procédé selon la revendication-14, caractérisé en ce que le liquide de coagulation consiste en une solution de 10 à 48% en poids de N-méthyl-2-pyrrolidone.
21. Procédé selon la revendication 14, caractérisé en ce que le liquid de coagulation est à une température comprise entre 5 et 80°C.
22. Procédé selon la revendication 14, caractérisé en ce que la réticulation est effectuée par application de rayons ultraviolets à partir d'une source de puissance comprise entre 0,5 et 5 KW, la feuille brute semblable au papier étant éloignée de la source de 1 à 100 cm, pendant une durée de 10 à 1000 secondes.
23. Procédé selon la revendication 14, caractérisé en ce que la réticulation est effectuée par application de rayons d'électrons à une dose de 0,5 Mrad ou plus.
24. Procédé selon la revendication 14, caractérisé en ce que la réticulation est effectuée par chauffage de la feuille brute semblable au papier à une température de 110° à 360°C.
25. Procédé selon la revendication 14, caractérisé en ce que la feuille semblable au papier, après ou pendant la réticulation, est soumise à une pression de 4 KN/cm2.
26. Procédé de fabrication de la feuille semblable au papier en polyamide aromatique selon la revendication 1, caractérisé en ce qu'il comprend les étapes suivantes:
- la dissolution du polyamide aromatique dans un solvant organique pour obtenir une solution de polymère,
- la mise en contact de cette solution de polymère avec un liquide coagulant accompagné d'agitation énergique du liquide pour préparer les constituants de polyamide aromatique sous forme de particules amorphes,
- la séparation des particules amorphes du liquide coagulant pour obtenir le constituant de pulpe synthétique,
- la mise en suspension du constituant de pulpe synthétique ensemble avec des fibres courtes dans l'eau pour obtenir une suspension dans laquelle le rapport en poids de la pulpe synthétique au constituant fibreux varie de 1:9 à 9:1,
- le façonnage d'une feuille brute semblable au papier à partir de la suspension par un procédé de technique papetière,
- l'imprégnation de la feuille brute semblable au papier au moyen d'un agent réticulant, et
- la réticulation des molécules du polyamide aromatique au moyen de l'agent réticulant dans la feuille par application de rayons ultraviolets, de rayons d'électrons ou de chaleur, l'agent réticulant comprenant au moins un composé spécifié dans la revendication 1.
27. Procédé selon la revendication 26, caractérisé en ce que la teneur de l'agent réticulant qui imprègne la feuille varie entre 0,1 à 10% par rapport au poids total de la feuille brute semblable au papier.
EP19800102204 1979-05-09 1980-04-24 Feuille en polyamide aromatique semblable au papier et procédés pour sa préparation Expired EP0019113B1 (fr)

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JP55640/79 1979-05-09
JP5564079A JPS55148300A (en) 1979-05-09 1979-05-09 Aromatic polyamide synthetic paper and production
JP64938/79 1979-05-28
JP6493879A JPS55158398A (en) 1979-05-28 1979-05-28 Aromatic polyamide paper like substance

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